diff options
Diffstat (limited to 'components/style_derive/compute_squared_distance.rs')
| -rw-r--r-- | components/style_derive/compute_squared_distance.rs | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/components/style_derive/compute_squared_distance.rs b/components/style_derive/compute_squared_distance.rs index 5b414206cda..f7e50c6bb00 100644 --- a/components/style_derive/compute_squared_distance.rs +++ b/components/style_derive/compute_squared_distance.rs @@ -2,7 +2,7 @@ * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ -use animate::{AnimationInputAttrs, AnimationVariantAttrs}; +use animate::{AnimationInputAttrs, AnimationVariantAttrs, AnimationFieldAttrs}; use cg; use quote::Tokens; use syn::{DeriveInput, Path}; @@ -47,8 +47,23 @@ pub fn derive(mut input: DeriveInput) -> Tokens { parse_quote!(#ty: ::values::distance::ComputeSquaredDistance), ); } - quote! { - ::values::distance::ComputeSquaredDistance::compute_squared_distance(#this, #other)? + + let animation_field_attrs = + cg::parse_field_attrs::<AnimationFieldAttrs>(&this.ast()); + + if animation_field_attrs.constant { + quote! { + { + if #this != #other { + return Err(()); + } + ::values::distance::SquaredDistance::from_sqrt(0.) + } + } + } else { + quote! { + ::values::distance::ComputeSquaredDistance::compute_squared_distance(#this, #other)? + } } }), quote!(+)); sum |